Commonwealth legislation

AD/DHC-1/31 Amdt 1 - Fin Rear Spar

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive requires owners/operators of English-built De Havilland DHC-1 Chipmunks to perform regular inspections of the fin rear spar for cracks and corrosion using dye‑penetrant methods per CAO 108.10 and British Aerospace guidance.

The first check must be done within 3 years or 600 flight hours (whichever first) and repeated at the same interval; aircraft modified with kits H283 or H360 per instructions are exempt from continued re‑inspections for those areas.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/DHC-1/31 Amdt 1 - Fin Rear Spar.

AD/DHC-1/31 Amdt 1 - Fin Rear Spar

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
De Havilland DHC-1 (Chipmunk) Series Aeroplanes

AD/DHC-1/31

Amdt 1

Fin Rear Spar 1/96

Applicability: All English production aircraft.

Requirement: Inspect the fin structure for cracks and corrosion in accordance with paragraphs 2, 3 and 5 of British Aerospace Technical News Sheet (TNS) CT (C1) No. 156 Issue 4. Conduct the dye penetrant inspections in accordance with CAO 108.10.

Modifications H283 and H360 performed in accordance with paragraphs 3 and 5 respectively of TNS No. 156 Issue 4, cancel the re-inspection requirements of paragraphs 3 and 5 respectively.

Compliance: Inspect in accordance with paragraphs 2, 3, and 5 within 3 years or 600 hours, whichever occurs first, since the last inspection.

Thereafter perform all the Requirement inspections at intervals not to exceed 3 years or 600 hours, whichever occurs first.

This Amendment is effective from 4 May 1996.

Background: British Aerospace has reported that cracks have been found in the fin rear spar at three critical locations, and that corrosion has been found in the internal fin structure. Amendment 1 incorporates Issue 4 of TNS No. 156, which revises paragraph 5 inspection interval from 6 years or 600 hours, to 3 years or 600 hours.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/DHC-1/31 Amdt 1 - Fin Rear Spar